CN101271857B - Substrate transfer apparatus, substrate transfer method - Google Patents

Substrate transfer apparatus, substrate transfer method Download PDF

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Publication number
CN101271857B
CN101271857B CN2008100858638A CN200810085863A CN101271857B CN 101271857 B CN101271857 B CN 101271857B CN 2008100858638 A CN2008100858638 A CN 2008100858638A CN 200810085863 A CN200810085863 A CN 200810085863A CN 101271857 B CN101271857 B CN 101271857B
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fork
substrate
optical sensor
mentioned
height
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CN101271857A (en
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阿部洋
小原美鹤
阿部任弘
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Tokyo Electron Ltd
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Tokyo Electron Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
    • H01L21/677—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for conveying, e.g. between different workstations
    • H01L21/67763—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for conveying, e.g. between different workstations the wafers being stored in a carrier, involving loading and unloading
    • H01L21/67778—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for conveying, e.g. between different workstations the wafers being stored in a carrier, involving loading and unloading involving loading and unloading of wafers
    • H01L21/67781—Batch transfer of wafers
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
    • G05B19/402—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by control arrangements for positioning, e.g. centring a tool relative to a hole in the workpiece, additional detection means to correct position
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
    • H01L21/67005—Apparatus not specifically provided for elsewhere
    • H01L21/67242—Apparatus for monitoring, sorting or marking
    • H01L21/67259—Position monitoring, e.g. misposition detection or presence detection
    • H01L21/67265—Position monitoring, e.g. misposition detection or presence detection of substrates stored in a container, a magazine, a carrier, a boat or the like
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
    • H01L21/677—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for conveying, e.g. between different workstations
    • H01L21/67763—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for conveying, e.g. between different workstations the wafers being stored in a carrier, involving loading and unloading
    • H01L21/67766—Mechanical parts of transfer devices
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/40—Robotics, robotics mapping to robotics vision
    • G05B2219/40562—Position and orientation of end effector, teach probe, track them
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S414/00—Material or article handling
    • Y10S414/135—Associated with semiconductor wafer handling
    • Y10S414/137—Associated with semiconductor wafer handling including means for charging or discharging wafer cassette
    • Y10S414/138—Wafers positioned vertically within cassette

Abstract

A substrate transfer apparatus 100 includes a substrate transport means 4 having a transport base 5 and a plurality of retention arms 41 a- 41 e for retaining substrates W, an optical sensor 62 that is used to define a horizontal optical axis L, an elevator means 52 for moving the transport base 5 up and down, and a height detection means 54 for detecting the height of the transport base 5 relative to the optical axis L. In accordance with a light-reception/no-light-reception detection result fed from the optical sensor 62 and the height of the transport base 5 , a judgment means 72 a of a control section 7 judges whether the postures of the retention arms 41 a- 41 e relative to the horizontal plane are normal. When the judgment means 72 a judges that the postures of the retention arms 41 a- 41 e relative to the horizontal plane are abnormal, the control section 7 exercises control to stop the substrate transport means 4.

Description

Substrate shifting apparatus and substrate transfer method
Technical field
The present invention relates to when the maintenance tool that keeps a plurality of substrates such as semiconductor wafer for example through keeping arm from the shelf shape takes out substrate, can prevent substrate shifting apparatus, the substrate transfer method of this keeping arm and substrate contacts and the storage medium that in this substrate transfer method, uses reliably.
Background technology
A kind of as semiconductor-fabricating device has the annealing device that (by the gross) simultaneously heat-treat a plurality of semiconductor wafers (below be called " wafer ").This annealing device is for example shown in figure 16, has to move into moving into of taking out of and take out of region S a the carrier of taking in a plurality of wafers 1 10 is outside relatively, through automatic carrying manipulator or operator above-mentioned carrier 10 is moved into above-mentioned moving into and takes out of region S a.Through shifting apparatus 11 wafer 1 transfer in the above-mentioned carrier 10 is kept to the shelf shape on the brilliant boat 12 of a plurality of wafers 1 then, through moving into heat-treatment furnace not shown in the figures by crystalline substance boat 12, the heat treatment of simultaneously a plurality of wafers 1 being stipulated.
Above-mentioned shifting apparatus 11; Comprise free lifting, round approximate vertical the axle rotate freely and also on general horizontal direction with moving freely the formation base station 14; With a plurality of forks 13 that are used for keeping a plurality of for example 5 wafers 1 that freely constitute along this base station 14, for example pass through 5 forks 13 with conveyance together, the transfer in carrier 10 and between the brilliant boat 12 of 5 wafers 1 with advancing and retreat.At this moment, for example in carrier 10 or brilliant boat 12, wafer 1 each other under the state at the interval of regulation, keeps its periphery through maintaining part not shown in the figures at neighbouring wafer.In 5 forks 13 each is inserted into the space of wafer 1 below that is maintained in carrier 10 or the brilliant boat 12 then.Each fork 13 is risen, wafer was put on each fork 13 in 1 year thereby wafer 1 is lifted from above-mentioned maintaining part.Then through fork 13 is withdrawed from, transferring plates 1 on carrier 10 or the brilliant boat 12.Thereafter, through shifting apparatus 11 with wafer 1 conveyance to the transfer destination.
, in above-mentioned fork 13, its base end side is maintained in the advance and retreat portion 15 under the state fixing with screw.But; Because the long-term fork 13 that uses continuously, the adjustment mistake that above-mentioned screw is fixing etc., shown in figure 17 from last several the 4th fork 13 that kind; Exist fork 13 relative horizontal planes not parallel; The front end relative datum position of fork 13 produces the inclination of above-below direction, at fork 13 warpage, the situation that the front end relative datum position of this fork 13 tilts at above-below direction takes place from one's body.
At this, carrying wafer 1 distance each other of putting on carrier 10 or brilliant boat 12 is about about 6mm～12mm.Therefore, if the front end of fork 13 tilts at above-below direction like this, then from above-mentioned carrier 10 or brilliant boat 12 reception wafers 1 time, wafer 1 contacts with fork 13.On the surface of wafer 1, form damage thus,, may produce particle thus owing to contact and the surface of damage wafers 1 with fork 13.
Therefore to carry out the inspection that there is not damaged on the surface or is not attached with blemish such as particle to wafer 1.But the testing fixture that the blemish to wafer 1 as existing is checked is arranged on the zone away from heat-treatment furnace.Therefore, the heat treatment that wafer 1 is stipulated, after turning back to this wafer 1 in the carrier 10, with these carrier 10 conveyances in testing fixture, the inspection that the wafer that is included in the inspection usefulness in the carrier 10 is stipulated.
When finding that in this inspection step damage is arranged or be attached with the defective of particle etc. on the surface of wafer 1, promptly stop annealing device in this moment.Confirm that then whether this defective is to be tilted and to cause fork 13 contact with wafer caused at above-below direction by fork 13, if will carry out the position adjustment of fork 13 and perhaps keep in repair.
But, under the situation of carrying out wafer 1 inspection like this after the heat treatment, when the table of discovery planar defect, in heat-treatment furnace, not only tested a collection of wafer 1 is handled, and the next group wafer is also being handled.Therefore,, carry out the position adjustment or the maintenance of fork 13, also exist on treated before this a large amount of wafer surface and defective takes place, the problem that rate of finished products reduces even promptly stop annealing device.In addition,, then in the time that this maintenance needs, device can not be moved, thereby the running rate of device is descended, so this point also becomes the main cause that productivity ratio worsens if promptly stop annealing device and fork 13 is keeped in repair.
In recent years, thereby for the number that increases every batch processing improves treatment effeciency, the tendency that has the arrangement pitch that makes the wafer on brilliant boat 12 to become narrower.In addition, there is the increasing tendency of wafer diameter.Be accompanied by this, worry is elongated from the size of base end side to the front end of fork 13, and the inclination of fork 13 relative horizontal planes increase, and problem is just more obvious like this.
Therefore present inventors are to checking the inclination of the above-below direction of fork 13 before receiving wafer 1 from carrier 10; Contact through carry out the wafers 1 that position adjustment suppresses in fork 13 and the carrier 10 in advance, prevent that the method for generation defective on the surface of wafer 1 from studying.In this technology, the special structure of opening the 2005-51171 communique has been proposed as the inclination of the above-below direction of inspection fork.
This spy opens the 2005-51171 communique, has proposed at the lower wall portion of load lock chamber optical sensor to be installed, and utilizes this optical sensor to measure the distance of vertical direction of the blade (blade) of wafer transfer manipulator, measures the degree of sag of above-mentioned blade.But open in the structure of 2005-51171 communique this spy; Because the optical axis of optical sensor forms in vertical direction; So can only measure to single fork; For example in the shifting apparatus of the type that 5 forks are advanced and retreat together, owing to not checking the inclination of the above-below direction of whole forks, so can't solve problem of the present invention.
On the other hand, open the position deviation that has proposed to utilize the wafer in the reflective photoelectric sensor detection wafer case in the 2000-124290 communique, and, prevent the technology that the wafer in wafer case contacts with manipulator based on this detected value control manipulator the spy.But this technology is a problem with the position deviation of the wafer in the wafer case, is not conceived to before from carrier, receiving wafer, and the go forward side by side problem of the present invention of line position adjustment of the inclination of the above-below direction of inspection fork can't solve problem of the present invention.
Patent documentation 1: TOHKEMY 2005-51171 communique
Patent documentation 2: TOHKEMY 2000-124290 communique
Summary of the invention
The present invention considers these problems and accomplishes that its purpose is to provide a kind of technology, in the time of can in the maintenance tool that keeps a plurality of substrates through keeping arm from the shelf shape, taking out substrate, prevents this keeping arm and substrate contacts.
Therefore, substrate shifting apparatus of the present invention is set in the substrate board treatment, carries to put a plurality of substrates, it is characterized in that, comprising: keep tool, the shelf shape keeps a plurality of substrates; The substrate transferring unit takes out said substrate from said maintenance tool, has when keeping said substrate the keeping arm of the approximate horizontal that freely is provided with along advance and retreat axle advance and retreat and supports the conveyance matrix of said keeping arm; Optical sensor forms the optical axis of level, and said optical axis is positioned at the position of said optical sensor with respect to said conveyance matrix peripheral side of the said keeping arm of crosscut when going up and down; Lifting unit links with said conveyance matrix, and said conveyance matrix is relatively gone up and down with respect to said optical sensor; The height and position detecting unit links with said lifting unit, detects the height and position of said conveyance matrix with respect to said optical axis; And control part; Has judging unit; Said judging unit is connected with said height and position detecting unit with said optical sensor; Do not keep at said keeping arm under the state of said substrate,, judge whether said keeping arm posture with respect to the horizontal plane is normal based on through making said conveyance matrix receive the testing result of light and the height and position of said conveyance matrix with respect to the light-non-that receives that said optical sensor relatively goes up and down to obtain from said optical sensor; During with respect to the abnormal posture of said horizontal plane, said control part stopped said substrate transferring unit before from said maintenance tool, taking out next substrate at the said keeping arm of judgment unit judges.
Can be on above-mentioned conveyance matrix can advance and retreat independently of each other or the mode of advance and retreat is range upon range of together that a plurality of keeping arms are set.Can constitute above-mentioned lifting unit goes up and down above-mentioned conveyance matrix with the mode of the optical axis of the common optical sensor of above-mentioned a plurality of keeping arm crosscuts; Whether the above-mentioned judging unit of above-mentioned control part carries out above-mentioned posture in above-mentioned a plurality of keeping arms each and judges normally.
Can constitute on above-mentioned conveyance matrix so that the mode of independent advance and retreat mutually is range upon range of a plurality of keeping arms are set; Control part takes out the mode of aforesaid substrate aforesaid substrate conveyance unit is controlled under the situation of the above-mentioned abnormal posture of judging a keeping arm from above-mentioned maintenance tool with the keeping arm that utilizes other.
The above-mentioned judging unit of above-mentioned control part can be for receiving the testing result of light based on the height and position of above-mentioned conveyance matrix with from the light-non-that receives of above-mentioned optical sensor, and whether the axial posture of above-mentioned advance and retreat of further judging above-mentioned keeping arm normal unit.In addition; Can constitute by range sensor for above-mentioned optical sensor; Above-mentioned judging unit is based on the height and position of above-mentioned conveyance matrix and the distance between above-mentioned range sensor and the above-mentioned keeping arm, judges further whether the posture of left and right directions of above-mentioned keeping arm is normal.
Substrate transfer method of the present invention, it uses substrate shifting apparatus, and said substrate shifting apparatus has: keep tool, the shelf shape keeps a plurality of substrates; The substrate transferring unit takes out said substrate from said maintenance tool, has when keeping said substrate the keeping arm of the approximate horizontal that freely is provided with along advance and retreat axle advance and retreat and supports the conveyance matrix of said keeping arm; And optical sensor; The optical axis of formation level; Said optical axis is positioned at the position of said optical sensor with respect to said conveyance matrix peripheral side of the said keeping arm of crosscut when going up and down; Said substrate transfer method is characterized in that, comprising: do not keep under the state of aforesaid substrate at above-mentioned maintenance tool; Above-mentioned conveyance matrix is relatively gone up and down with respect to above-mentioned optical sensor, obtain above-mentioned conveyance matrix and receive the step of the testing result of light with respect to the height and position of above-mentioned optical axis with from the light-non-that receives of above-mentioned optical sensor; Based on the testing result that receives light-non-to receive light from above-mentioned optical sensor above-mentioned and the height and position of above-mentioned conveyance matrix, judge whether normal step of above-mentioned keeping arm posture with respect to the horizontal plane; With when judging above-mentioned keeping arm with respect to the abnormal posture of above-mentioned horizontal plane, the step of controlling with the mode that take out next substrate from above-mentioned maintenance tool before, stops aforesaid substrate conveyance unit.
Substrate transfer method of the present invention also possesses based on the height and position of above-mentioned conveyance matrix with from the above-mentioned testing result that receives light-non-to receive light of above-mentioned optical sensor, and whether the axial posture of above-mentioned advance and retreat of judging above-mentioned keeping arm normal step.In addition, also possess above-mentioned optical sensor and constitute,, judge the whether normal step of posture of the left and right directions of above-mentioned keeping arm based on the height and position of above-mentioned conveyance matrix and the distance between above-mentioned range sensor and the above-mentioned keeping arm by range sensor.
Storage medium of the present invention, it uses on the substrate transfer method of using substrate shifting apparatus, is used to store the computer program of carrying out on computers, and it is characterized in that: said substrate shifting apparatus has: keep tool, the shelf shape keeps a plurality of substrates; The substrate transferring unit takes out said substrate from said maintenance tool, has when keeping said substrate the keeping arm of the approximate horizontal that freely is provided with along advance and retreat axle advance and retreat and supports the conveyance matrix of said keeping arm; And optical sensor; The optical axis of formation level; Said optical axis is positioned at the position of said optical sensor with respect to said conveyance matrix peripheral side of the said keeping arm of crosscut when going up and down; The aforesaid substrate method for shifting comprises: do not keep under the state of aforesaid substrate at above-mentioned maintenance tool, above-mentioned conveyance matrix is relatively gone up and down with respect to above-mentioned optical sensor, obtain above-mentioned conveyance matrix and receive the step of the testing result of light with respect to the height and position of above-mentioned optical axis with from the light-non-that receives of above-mentioned optical sensor; Based on the testing result that receives light-non-to receive light from above-mentioned optical sensor above-mentioned and the height and position of above-mentioned conveyance matrix, judge whether normal step of above-mentioned keeping arm posture with respect to the horizontal plane; With when judging above-mentioned keeping arm with respect to the abnormal posture of above-mentioned horizontal plane, the step of controlling with the mode that take out next substrate from above-mentioned maintenance tool before, stops aforesaid substrate conveyance unit.
So, according to the present invention, because whether the maintenance tool that keeps a plurality of substrates through keeping arm from the shelf shape, detect keeping arm front and back posture with respect to the horizontal plane before the taking-up substrate normal, so can prevent keeping arm and substrate contacts.Can prevent to result from the generation of the substrate surface defects of keeping arm and substrate contacts thus, so the qualification rate of product improves.
Description of drawings
Fig. 1 is the integrally-built stereogram of an execution mode of the substrate shifting apparatus that the present invention relates to of expression.
Fig. 2 is the vertical cross-section diagram of expression aforesaid substrate shifting apparatus.
Fig. 3 is the horizontal sectional view (the III-III alignment view of Fig. 2) of expression aforesaid substrate shifting apparatus.
Fig. 4 is the approximate three-dimensional map of wafer transfer mechanism, carrier and the inspection unit of expression aforesaid substrate shifting apparatus.
Fig. 5 is the structure chart of above-mentioned wafer transfer mechanism of expression and control part.
Fig. 6 is the vertical cross-section diagram of above-mentioned wafer transfer mechanism of expression and inspection unit.
Fig. 7 is the plane graph (the VII-VII alignment view of Fig. 6) of above-mentioned wafer transfer mechanism of expression and inspection unit.
Fig. 8 is the flow chart that is used for explaining the inspection step of above-mentioned wafer transfer mechanism.
Fig. 9 A～Fig. 9 C is the block diagram that is used for explaining the inspection step of above-mentioned wafer transfer mechanism.
Figure 10 A～Figure 10 B is the block diagram that is used for explaining the inspection step of above-mentioned wafer transfer mechanism.
Figure 11 is the plane graph of another example of expression optical sensor.
Figure 12 A～Figure 12 B is axial plane inclined figure of advance and retreat and the front elevation that is used for explaining above-mentioned wafer transfer mechanism respectively.
Figure 13 is the key diagram of inspection step that is used for explaining the axial inclination of advance and retreat of above-mentioned wafer transfer mechanism.
Figure 14 A～Figure 14 B is the key diagram of inspection step of inclination that is used for explaining the left and right directions of above-mentioned wafer transfer mechanism.
Figure 15 A～Figure 15 C is the key diagram of an example of determining method of the inspection height and position of the above-mentioned wafer transfer of expression mechanism.
Figure 16 is the end view of the fork of the existing shifting apparatus of expression.
Figure 17 is the end view of the fork of the existing shifting apparatus of expression.
Embodiment
Below, the execution mode of the substrate shifting apparatus that the present invention relates to that is applicable to vertical heat processing apparatus is described.Fig. 1 is the stereoscopic figure of expression vertical heat processing apparatus, and Fig. 2 and Fig. 3 are vertical disconnected end view and the summary horizontal sectional views of representing that respectively vertical heat processing apparatus is inner.
In Fig. 1～Fig. 3, vertical heat processing apparatus 200 is when accommodating a plurality of wafer W (substrate), and these a plurality of wafer W are implemented heat-treating apparatus.In addition, substrate shifting apparatus 100 is arranged in such vertical heat processing apparatus 200.Reference marks 2 among the figure is the frameworks that constitute the exterior body of vertical heat processing apparatus 200; In this framework 2, be provided be used for the relative vertical heat processing apparatus 200 of the carrier that contains wafer W (maintenance tool) C moving into of moving into, take out of take out of region S 1 and be used in the conveyance support C wafer W and move into after loading zone S2 in the heat-treatment furnace stated as the transfer zone.Move into and take out of region S 1 and load regional S2 and separated by next door 21, move into and take out of region S 1 and be air atmosphere, loading regional S2 is for example nitrogen (N of non-active gas atmosphere 2) atmosphere of atmosphere or clean dry gas (particle and organic principle are few, and dew point is at the air below-60 ℃).
Above-mentioned moving into taken out of region S 1 by seeing that from the front of vertical heat processing apparatus 200 first area 22 that is positioned at the front and the second area 23 that is positioned at the inside constitute.Wherein in first area 22, be provided with first year of being used to accommodate two support C for example and put platform 24.As support C; Use a plurality of for example 25 as the for example diameters of substrate as the wafer W of 300mm across the assortment of regulation at interval by the assortment of shelf shape and accommodated, the carrier of the closed type that for example constitutes by resin that the conveying end not shown in the figures of front is utilized that lid stops up.In moving into the second area 23 of taking out of region S 1, dispose and put platform 25 in second year.In addition, be provided with the carrier Storage Department 26 of keeping support C on the top of second area 23, and be provided with and put platform 24 at first year, put between platform 25 and the carrier Storage Department 26 the carrier transport mechanism 27 of conveyance support C mutually in second year.This carrier transport mechanism 27 has: being configured to can free lifting, and has the lifting unit 27a of the guide rail that extends about seeing from the front of vertical heat processing apparatus 200; By the moving part 27b of above-mentioned rail guidance and move left and right; Be arranged on this moving part 27b, keep the flange part 20 above the support C, the arm 27c of conveyance support C in the horizontal direction through maintaining part 27d.
On above-mentioned next door 21, form peristome 20, put the support C of putting at second year on the platform 25 when contact, make that support C is interior to be connected with the regional S2 of loading with this next door 21 when carrying.In addition, the loading of next door 21 zone S2 side is provided with the door 28 that opens and closes above-mentioned peristome 20, and is provided with and cover switching mechanism 29, the lid of switching support C under this 28 closing state.Above-mentioned door 28 has door open/close machine not shown in the figures, and this door open/close machine constitutes, and after opening the lid of support C, makes and covers switching mechanism 29 above or below lid is for example kept out of the way, and makes not hinder the transfer of wafer W.In addition; The side portion of the peristome 20 of next door 21 is provided with non-active gas supply pipe (not shown); Be provided with the exhaust channel (not shown) in the lower end of peristome 20, thereby be configured in the support C of opened lid to supply with for example nitrogen and the air of the inside gas displacement unit of replacing of non-active gas thus.
In the S2 of above-mentioned loading zone, be provided with the lower end as fire door and the vertical heat treatment furnace 31 of opening.Below this heat-treatment furnace 31, be provided with brilliant boat 32; Keep tool as substrate, with a plurality of substrate W with predetermined arrangement at interval (for example on above-below direction above the adjacent upside wafer with above the downside wafer of this wafer between distance be about 8～16mm) the shelf shape arranges maintenance.This crystalline substance boat 32 is carried to be put on block 34.Block 34 is supported by elevating mechanism 35, utilizes this elevating mechanism 35 that heat-treatment furnace 31 is moved into or taken out of to brilliant boat 32.In addition, between the peristome 20 in brilliant boat 32 and next door 21, be provided with wafer transfer mechanism (wafer transfer unit) 4.Utilize this wafer transfer mechanism 4 between the brilliant boat 32 and the support C of putting on the platform 25 in second year, to carry out the conveyance of wafer.In addition, inspection unit 6 is arranged on the position that the wafer transfer mechanism 4 that loads in the regional S2 can get into (access), in this execution mode, be arranged on above-mentioned peristome 20 below.
Then specify above-mentioned wafer transfer mechanism 4 and inspection unit 6 with reference to accompanying drawing.The overall structure of wafer transfer mechanism 4 at first is described based on Fig. 3～Fig. 7.5 keeping arms (fork 41 (41a～41e)) that wafer transfer mechanism 4 has the approximate horizontal that keeps wafer W freely support the conveyance matrix 5 of fork 41a～41e with advancing and retreat.
As shown in Figure 5, conveyance matrix 5 links with the rotating mechanism that is made up of motor M1 51, and this rotating mechanism 51 links with elevating mechanism 52.Further, elevating mechanism 52 links (with reference to Fig. 3) with the guide rail that along about the orientation of support C, extends 53.That is, conveyance matrix 5 utilizes rotating mechanism 51 freely to rotate around vertical axis, utilize elevating mechanism 52 free liftings and along guide rail 53 on left and right directions freedom of movement formation.In addition, elevating mechanism 52 has lifting shaft 52a and the motor M2 that lifting shaft 52a is gone up and down.The lifting shaft 52a of elevating mechanism 52 utilizes the rotation of motor M2 to be gone up and down, and conveyance matrix 5 is gone up and down.In addition, motor M2 is connected with encoder 54.
In addition, fork 41 is by keeping each wafer W for example, and the first fork 41a, the second fork 41b, the 3rd fork 41c, the 4th fork 41d and the 5th fork 41e constitute.Each fork 41a～41e, for example as shown in Figure 7, have the space of seeing the clamping regulation from above and upwardly extending two wrist 42a, 42b in advance and retreat side.Each fork 41a～41e for example like Fig. 6 and shown in Figure 7, has the stage portion 43a, 43b, 43c, the 43d that form respectively in two places of two places of wrist 42a, 42b front and base end side.Stage portion 43a, 43b, 43c, 43d through at each fork 41a～41e upload the periphery of putting wafer W, under the state that wafer W is floated from the surface of fork 41 a little, it are kept.On the other hand, fork 41 base end parts are installed on the driving and reversing mechanism 45 through holding member 44.
When with reference to Fig. 6 this driving and reversing mechanism 45 being described, fork 41a～41e shown in Figure 6 for example constitutes that the 3rd fork 41c freely advances and retreat along conveyance matrix 5 separately.Fork 41a beyond the 3rd fork 41c, 41b, 41d, 41e constitute with 4 modes of advancing and retreat simultaneously.Promptly; Above-mentioned conveyance matrix 5 is provided with and is used for making the 3rd fork 41c first driving and reversing mechanism 45a that moves forward and the second driving and reversing mechanism 45b that is used for four of 4 fork 41a, 41b, 41d, 41e beyond the 3rd fork 41c are moved forward simultaneously, they is freely advanced and retreat on fore-and-aft direction along conveyance matrix 5 respectively move.
In the second driving and reversing mechanism 45b, an end of the long side direction of conveyance matrix 5 and the other end be equipped with respectively the drive pulley 46 that drives by stepping motor not shown in the figures that moves drive division as advance and retreat and with the follow-up pulley 47 of these drive pulley 46 interlocks.Volume is hung and is with 48 synchronously on this drive pulley 46 and follow-up pulley 47, and this is connected with the lower end of the above-mentioned second driving and reversing mechanism 45b with 48 synchronously.In addition, on conveyance matrix 5, be provided with the slit (not shown) that allows the second driving and reversing mechanism 45b to move.The first driving and reversing mechanism 45a also has the same structure with the second driving and reversing mechanism 45b.So, wafer transfer mechanism 4 constitutes with the mode of two actions of the conveyance together of the monolithic conveyance that can carry out 1 wafer W of independent action conveyance through the first driving and reversing mechanism 45a and a plurality of for example 5 wafer W of collaborative while conveyance through the first and second driving and reversing mechanism 45a, 45b.
Inspection unit 6 then is described.This inspection unit 6 is used for checking whether fork 41a～41e front and back posture with respect to the horizontal plane is normal.Whether normal for above-mentioned posture, can on above-below direction, whether tilt to judge through the front end of inspection fork 41a～41e.Above-mentioned inspection unit 6 is arranged on the position that fork 41a～41e can get into, the face that in this example, gets into fork 41a～41e the mode that loads regional S2 inner opening be arranged on put in second year platform 25 below.
This inspection unit 6 has framework 61 that is provided with peristome 60 in front and the optical sensor 62 that is installed in this framework 61.Wherein framework 61 has the front end that can make fork 41a～41e and is inserted into the inspection position in the framework 61 together through peristome 60, and fork 41a～41e can be from the size of the degree of this position one lifting.
In addition, optical sensor 62 for example is made up of the infiltration type optical sensor, is arranged in the framework 61 with the mode of the optical axis L of formation level.That is, optical sensor 62 constitutes by the illuminating part on the side wall portion that is installed in framework 61 1 sides 63 with the light accepting part 64 that is arranged on the optical axis L of this illuminating part 63 with these illuminating part 63 relative modes.In addition, 62 relative up-downs freely constitute the conveyance matrix 5 of wafer transfer mechanism 4 with optical sensor.That is, when the optical axis L of optical sensor 62 is located at optical sensor 62 with respect to the 5 relative up-downs of conveyance matrix, the position of crosscut fork 41a～41e peripheral side.In addition, above-mentioned elevating mechanism 52 is equivalent to lifting unit, and above-mentioned encoder 54 is equivalent to detect the position detection unit of conveyance matrix 5 with respect to the height and position of above-mentioned optical axis L.In addition, conveyance matrix 5 is outputed to control part 7 with respect to the height and position information of above-mentioned optical axis L through encoder 54.Part about this so-called above-mentioned inspection position for example is meant from the front end of fork 41a～41e to 40mm (distance A 1 of Fig. 7) is inserted into the position in the framework 61.
At this moment; The size of framework 61 and the installation site of optical sensor 62 are set; For example as shown in Figure 6, make that when fork 41a～41e is inserted into above-mentioned inspection position the optical axis L of optical sensor 62 just is positioned at the top of the fork 41a of epimere; Simultaneously when fork 41a～41e when this position rises, the fork 41e of hypomere just is positioned at the top of the optical axis L of optical sensor 62.This moment, above-mentioned optical axis L was preferably placed at the for example position from about fork 41a～41e front end 5～10mm (distance A 2 of Fig. 7).At this, as long as A1＞A2, just can freely set above-mentioned distance A 1 and A2, but in this example, be located at above-mentioned optical axis L that fork 41a～41e uploads the stage portion 43a that is equipped with wafer W, near the 43b the mode of side is set above-mentioned distance A 2.
Used for example Fibre Optical Sensor as above-mentioned optical sensor 62, can light projector angle be set at 2～3 degree, detected well so can carry out precision through using this Fibre Optical Sensor.In addition, the light-non-testing result of light that receives that receives of optical sensor 62 is outputed on the control part 7 of back narration.
Then explanation is arranged on the control part 7 in the aforesaid substrate shifting apparatus 100 with reference to Fig. 5.This control part 7 for example is made up of computer, possesses the data processing division that is made up of program, memory, CPU71.In said procedure, to transmit control signal from control part 7 each one to substrate shifting apparatus 100, order (each step) is enrolled in the conveyance of stating after making mode in sequence.In addition, the picture of aforementioned calculation machine is the picture of display unit 81, utilizing this display unit 81, and the selection that the processing substrate that can stipulate or inspection are handled, the mode of the input operation of the parameter during each is handled constitutes, and the check result of stating after showing.The storage medium that this program is stored in computer for example is installed in the control part 7 in floppy disk, CD, hard disk, the MO storage parts such as (photomagneto disks) again.
In addition, in control part 7, also comprise audit program 72, the reference data storage part 73 of the fork 41a～41e front and back posture with respect to the horizontal plane that is used for checking wafer transfer mechanism 4 and obtain data store 74.In addition, control part 7 is connected with warning generating unit 82 with the display unit 81 with the elevating mechanism 52 of fork 41a～41e, encoder 54, optical sensor 62, computer, and the modes of sending the control signal of regulation to these devices constitute.
Said reference data store 73 is the unit of Memory Reference form T1～Tn.So-called this benchmark form T1～Tn; In the front and back posture with respect to the horizontal plane of fork 41a～41e just often, the height and position that makes conveyance matrix 5 with whether interdict this moment receive light-non-data (testing result) of light that receive corresponding from the optical axis L of optical sensor 62.Because fork 41a～41e constitutes with the mode that changes at the arrangement pitch of separately above-below direction; So in said reference data store 73; Except with the corresponding a plurality of benchmark forms of this arrangement pitch, also prepare, store through after the benchmark form of inspection usefulness of other method of stating.
This from optical sensor 62 receive light-non-data that receive light, obtained as " 1 (opening) " by the light time, obtained as " 0 (pass) " by the light time non-.In addition; Said reference form T1～Tn is to be normal wafer transfer mechanism 4 through using fork 41a～41e front and back posture with respect to the horizontal plane; Mode with whole fork 41a～above-mentioned optical axis L of 41e crosscut is gone up and down the above-mentioned relatively optical axis L of conveyance matrix 5; Conveyance matrix 5 height and positions of this moment obtain as the pulse value of encoder 54, and what obtain optical sensor 62 simultaneously receives light-non-testing result that receives light, makes through obtaining pulse pattern corresponding with it.In addition; What is called obtains data store 74; Be when the above-mentioned relatively optical axis L of the conveyance matrix 5 of wafer transfer mechanism 4 that makes the inspection object is gone up and down, obtain the height and position of conveyance matrix 5 and receive light-non-unit that receives the light data and store from optical sensor 62.
Whether normally above-mentioned audit program 72 has unit 72b that when inspection, the driving of wafer transfer mechanism 4 is controlled and the above-mentioned posture of judging fork 41a～41e judging unit 72a.Wherein so-called judging unit 72a, be be stored in the said reference data store 73 benchmark form T1～Tn be stored in the above-mentioned data that obtain that obtain in the data store 74 and compare, normally whether the posture of judging fork 41a～41e the unit.And; Control part 7 in the posture of fork 41a～41e just often; Sign on to wafer transfer device output next wafer W of taking-up from support C; On the other hand, when noting abnormalities, just stop to take out the instruction of next wafer W and the alarm indication instruction of regulation from support C to 4 outputs of wafer transfer device.At this, so-called alarm indication refers to the generation of the for example bright lamp of the generating unit 82 of reporting to the police in this embodiment, alarm sound, or to the alarm indication of display unit 81.
Then the flow process of the wafer W of explanation in such vertical heat processing apparatus 200 is at first carried support C to put to carry through the automatic carrying manipulator not shown in the figures that moves along the top of clean room and is put on the platform 24.Then utilize carrier transport mechanism 27 that platform 25 year is put in the conveyance to the second of above-mentioned support C, this support C seals butts through the peristome 20 in mechanism not shown in the figures and next door 21.In addition, also there is after in a single day support C be incorporated in the carrier Storage Department 26 situation of year being put platform 25 by conveyance to the second.
Utilize this bonnet switching mechanism 29 to unload lower cover, then in support C, spray for example nitrogen of non-active gas, through in the nitrogen replacement support C and the space between support C and the door 28 from gas supply pipe not shown in the figures from support C.Afterwards, door 28, lid switching mechanism 29 and lid for example rise and keep out of the way from peristome 20, make in the support C to be in the state that is communicated with the regional S2 of loading.Then, wafer transfer mechanism 4 takes out the interior wafer W of support C successively and brilliant boat 32 is arrived in its transfer.When the wafer W in the support C is got sky, closing the lid of support C, retreat and make support C leave next door 21 thereby put platform 25 in second year with above-mentioned opposite action.27 conveyances of support C suppressed by vector transport mechanism are temporarily taken care of in carrier Storage Department 26.On the other hand, when on brilliant boat 32, having carried the wafer W of regulation number, brilliant boat 32 just by conveyance in heat-treatment furnace 31, wafer W is heat-treated for example CVD, annealing in process, oxidation processes etc.When heat treatment finishes, through wafer W being turned back in the support C with above-mentioned opposite action.
Then the inspection step of wafer transfer mechanism 4 is described with reference to Fig. 8～Figure 10.This checks step; When device erects; Also be not carried out to the time band of batch processing (for example carrying out brilliant boat 32 clean during) or support C carried to put carrying and put on the platform 24; Lid is removed, with in the nitrogen replacement support C and the processing in the space between support C and the door 28 during etc. enforcement.In addition, can also can perhaps whenever implement whenever from support C or brilliant boat 32 taking-up wafer W the time, implementing in each wafer W of taking out the regulation number at a distance from the stipulated time.
In this inspection step, at first use the for example benchmark form T1 of the display unit 81 selection regulations of computer.Shown in Fig. 9 A, make the peristome 60 of 5 fork 41a～41e and framework 61 relative then, the front end of these 5 fork 41a～41e is inserted into together the inspection position (step S1) of above-mentioned inspection unit 6.The first height and position Z1 that states after then conveyance matrix 5 being moved to, then shown in Fig. 9 B, Fig. 9 C, the tenth height and position Z10 that states after rising to from this position.Control part 7 is obtained and is received light-non-data that receive light from optical sensor 62 this moment.Control part 7 is whenever the data that obtain the optical sensor 62 in each height and position Z1～Z10 then, compares with the data of benchmark form T1, and judges unanimity-inconsistent (step S2, the step S3) of these data.
At this above-mentioned first height and position Z1～the tenth height and position Z10 is described; In each benchmark form T1; The first height and position Z1 is the height of the above-mentioned optical axis L of the first fork 41a peripheral side crosscut; The 2nd height and position Z2 is the height of optical axis L between the first fork 41a and the second fork 41b of optical sensor 62; The 3rd height and position Z3 is the height of the above-mentioned optical axis L of the 2nd fork 41b peripheral side crosscut; The 4th height and position Z4 is the height of above-mentioned optical axis L between the 2nd fork 41b and the 3rd fork 41c, and the 5th height and position Z5 is the height of the above-mentioned optical axis L of the 3rd fork 41c peripheral side crosscut, and the 6th height and position Z6 is the height of above-mentioned optical axis L between the 3rd fork 41c and the 4th fork 41d; The 7th height and position Z7 is the height of the above-mentioned optical axis L of the 4th fork 41d peripheral side crosscut; The 8th height and position Z8 is the height of above-mentioned optical axis L between the 4th fork 41d and the 5th fork 41e, and the 9th height and position Z9 is the height of the above-mentioned optical axis L of the 5th fork 41e peripheral side crosscut, and the 10th height and position Z10 is that above-mentioned optical axis L is positioned at the height below the 5th fork 41e.These when making benchmark form T1 in advance as the pulse value of encoder 54 and obtain.Then when checking, because according to the pulse value decision conveyance matrix 5 of encoder 54 height and position, so can obtain the data of the optical sensor 62 when conveyance matrix 5 is positioned at above-mentioned height and position Z1～Z10 with respect to optical axis L.
The judging unit 72a of control part 7 to the result that the data of the data that obtain and benchmark form T1 compare is then; Shown in Figure 10 A; When total data all with the signal pattern of said reference form T1 when consistent; The above-mentioned posture that the judging unit 72a of control part 7 judges fork 41a～41e is normal, to wafer transfer mechanism 4 output orders, begins from support C, to take out next wafer W (step S4).On the other hand, shown in Figure 10 B, even have one when inconsistent when the data of data that obtain and benchmark form T1, the judging unit 72a of control part 7 judges that the above-mentioned posture of fork 41a～41e is unusual.That is, the example shown in Figure 10 B is represented the for example situation of the front end downward direction inclination of the 4th fork 41d.In this case; For example at above-mentioned the 7th height and position Z7, the 4th fork 41d does not exist, so the data of optical sensor 62 become and receive light (1); On the other hand; At above-mentioned the 8th height and position Z8, because the 4th sagging fork 41d interdicts above-mentioned optical axis L, so the data of optical sensor 62 are the non-light (0) that receives.Therefore shown in Figure 10 B, the data that as a result of when inspection, obtain are different with the data of benchmark form T1.In addition, the comparison of the data of the data that obtain and benchmark form T1 being carried out through judging unit 72a can be carried out when the data that at every turn obtain from optical sensor 62, also can after obtaining total data, carry out.
When so judging the above-mentioned abnormal posture of fork 41a～41e, control part 7 carries out alarm indication (step S5) to the display unit 81 of computer with warning generating unit 82 output orders.Meanwhile, control part 7 is to wafer transfer mechanism 4 output orders, before from support C, taking out next wafer W, takes out of and stops fork 41a～41e (step S6) from inspection unit 6.Then, the operator adjusts or keeps in repair fork 41a～41e, makes it with respect to the horizontal plane parallel.After this, begin from support C to take out next wafer W, carry out equally from taking out wafer W in the support C successively and the operation of its transfer to brilliant boat 32 with noted earlier.
In such device, utilizing wafer transfer mechanism 4 takes out wafer W from support C before, normally whether the above-mentioned posture of carrying out fork 41a～41e inspection.When being judged as when unusual, just no longer carrying out taking-up, but after fork 41a～41e is adjusted, from support C, take out wafer W again from the wafer W of support C through wafer transfer mechanism 4.Therefore, because fork 41a～41e contacts with wafer W can prevent from support C to take out wafer W the time, so the generation of the damage of the wafer W that can prevent to be caused by this contact, the generation of particle can suppress the decline of the qualification rate of product.Because even wafer W has minimum damage or the attaching particles all can not be as launch, just can suppress the qualification rate reduction effectively so prevent that fork 41a～41e from contacting with wafer W.
In addition, because the inspection step of fork 41a～41e, be to carry out simultaneously with the replacement Treatment of aforesaid non-active gas in support C etc., so there is no need to prepare in addition the review time of fork 41a～41e, can suppress the reduction of productivity ratio.And; Even owing to find the above-mentioned abnormal posture of fork 41a～41e; Also can before from support C, taking out next wafer W, adjust, so can not occur as existing, during wafer W is handled, will installing the incident that promptly stops fork 41a～41e.Therefore do not worry reducing unit service factor, see the deterioration that yet can suppress productivity ratio from this point.
Further; A plurality of fork 41a～41e are carried out the whether inspection normally of above-mentioned posture, use common optical sensor 62, conveyance matrix 5 is relatively gone up and down with respect to optical axis L; Respectively fork 41a～41e is obtained the data from optical sensor 62 thus; So judge whether the posture of each fork 41a～41e is normal, therefore check that the necessary operations ratio is easier to, can carry out the good inspection of precision at short notice in addition.
So, use common optical sensor 62, need not open the regional S2 of loading and just can check, therefore can reduce the cost that inspection needs a plurality of fork 41a～41e.In addition, owing to fork 41a～41e relatively gone up and down with respect to optical sensor 62 and check, so the space occupied area that checked operation needs is little, saving that can the implementation space.
In the inspection whether normally of this above-mentioned posture that fork 41a～41e is carried out, can be the operator to thinking that the fork 41a～41e of above-mentioned abnormal posture carries out after adjusting once more.In this case, owing to can confirm the levelness of adjusted fork 41a～41e automatically, so can realize the raising of the adjustment precision of fork 41a～41e.
Above the present invention is shown in figure 11; Can use reflection type optical transducer 65 as optical sensor; In this case; When the above-mentioned inspection position that fork 41a～41e is inserted in the framework 61, the light that comes self-luminescent part 66 is by the reflection of the peripheral side of fork 41a～41e, and the mode that is positioned on this catoptrical optical axis L with light accepting part 67 disposes illuminating part 66 and light accepting part 67 respectively.
Then, as another embodiment of the invention, judge to using infiltration type optical sensor 62 or reflection type optical transducer 65 whether normal situation describes fork 41a～41e in the axial posture of advance and retreat.The situation of the axial abnormal posture of so-called above-mentioned advance and retreat, shown in Figure 12 A, Figure 12 B, for example referring to, fork 41 is the situation of center rotation with above-mentioned advance and retreat axle B.
In this inspection, for example fork 41a～41e is inserted into the above-mentioned inspection position of inspection unit 6.For example conveyance matrix 5 is risen to the top that the 5th fork 41e is positioned at the optical axis L of optical sensor 62 from the height that the first fork 41a is positioned at the below of above-mentioned optical axis L then; While is corresponding with respect to the height and position of above-mentioned optical axis L with conveyance matrix 5, obtains the data of the optical sensor 62 of this moment continuously at official hour.When fork 41a～41e is relatively gone up and down with respect to optical sensor 62, the thickness (amount of height) of the fork 41a～41e when interdicting above-mentioned optical axis L through just obtaining each fork 41a～41e to the umber of pulse counting of for example encoder 54.
For example use Figure 13, situation about tilting around the above-mentioned advance and retreat axle B with the first fork 41a is that example specifies, and the thickness (amount of height) when interdicting above-mentioned optical axis L if fork 41a tilts becomes big.In control part 7, be provided with in the above-mentioned posture of storing fork 41a～41e in advance when being normal; Make the data of optical sensor 62 corresponding with fork 41a～41e height and position data benchmark form T2 the time; The data 81 that the data of this benchmark form T2 are obtained during with inspection compare; Whether the thickness of judging each fork 41a～41e suitable unit, and the having or not of inclination around the above-mentioned advance and retreat axle B judged.
This moment control part 7; If the error of the amount of height of the fork 41a～41e of the data of the amount of height of the fork 41a～41e of the data that for example obtain 83 and benchmark form T2 is in the scope of regulation; The above-mentioned posture of then judging fork 41a～41e begins to utilize wafer transfer mechanism 4 from support C, to take out wafer W for normal.On the other hand, if surpass the scope of regulation then be judged as unusually, control part 7 control wafer transport mechanisms 4 stop to utilize wafer transfer mechanism 4 from support C, to take out wafer W.Thereafter, the operator carries out the adjustment operation of fork 41a～41e.
In addition in the present invention, as stated,, just can obtain data about neighbouring fork 41a～41e interval each other through when fork 41a～41e is relatively gone up and down with respect to optical sensor 62, the umber of pulse of encoder 54 being counted.Therefore, through obtaining the data at fork 41a～41e interval each other continuously, and above-mentioned data are kept watch on official hour, just can confirm fork 41a～41e state or posture through the time tendency that changes.In addition; Through these data are accumulated; When continuing which type of degree to use fork 41a～41e with; Whether the above-mentioned posture that just can dope fork 41a～41e overrun, can take place in the posture of fork 41a～41e unusual before, in official hour, fork 41a～41e is keeped in repair.
Further, as another execution mode, as optical sensor, whether normal situation describes inspection fork 41a～41e front and back posture with respect to the horizontal plane to service range transducer 68.In this example, for example shown in Figure 14 A, the range sensor 68 of the optical axis L of formation level is installed on the sidewall of framework 61.The distance that this range sensor 68 is adjusted the distance between the peripheral side of transducer 68 and fork 41a～41e is measured.In this case, also can range sensor 68 be arranged on the sidewall of framework 61, in the side of fork 41a～41e, the distance between the peripheral side of measuring distance transducer 68 and fork 41a～41e.Or, also can on two sidewalls of framework 61, range sensor 68 be set respectively, in the both sides of fork 41a～41e, the distance between the peripheral side of measuring distance transducer 68 and fork 41a～41e.
In this embodiment; Shown in Figure 14 B; In advance for above-mentioned posture fork 41a～41e just often; The range data of the range sensor 82 when obtaining conveyance matrix 5 and being positioned at the above-mentioned first height and position Z1～the tenth height and position Z10 makes and makes conveyance matrix 5 with respect to the height and position data of the optical axis L of range sensor 82 and the corresponding benchmark form of the range data T3 of range sensor 82, and is stored in the control part 7.The range data that on the inspection height and position of regulation, obtains when control part 7 has the data of this benchmark form T3 with inspection compares, and normally whether the above-mentioned posture of judging above-mentioned each fork 41a～41e the unit.
That is, if the posture of fork 41a～41e is normal, then the range data of benchmark form T3 is identical with the data that obtain.Therefore, if the error of range data that for example obtains data and benchmark form T3 in prescribed limit, then control part 7 judges that the posture of fork 41a～41e is normal, begins to utilize wafer transfer mechanism 4 from support C, to take out wafer W.On the other hand, if error overshoot scope is then judged the abnormal posture of fork 41a～41e, control part 7 control wafer transport mechanisms 4 stop to utilize wafer transfer mechanism 4 from support C, to take out wafer W.Thereafter, the operator carries out the adjustment operation of fork 41a～41e.
In this case, the range data during with each fork 41a～above-mentioned optical axis L of 41e crosscut is compared, and above-mentioned optical axis L is positioned at the range data of neighbouring fork 41a～41e each other the time and increases.Therefore; If the range data that obtains is littler than predefined fiducial value, then for receiving light (" 1 (ON) "), if the range data that obtains is bigger than said reference value; Then for the non-light (" 0 (OFF) ") that receives, also can be used as from the data of range sensor 68 and to receive light-non-to receive the data of light and obtain.
Can also use above-mentioned range sensor 68, judge whether the posture of fork 41a～41e left and right directions with respect to the horizontal plane is normal.In this case, for example in control part 7, be provided with the unit that the data of the said reference form T3 shown in Figure 14 B and the range data that obtains when the inspection are compared.This unit for example the first height and position Z1 obtain data when bigger than the range data of benchmark form T3, just such shown in the chain-dotted line of Figure 14 A, judge the first fork 41a left direction tilt.So inclination of the left and right directions of inspection fork 41a～41e; When not tilting; Control part 7 judges that the posture of fork 41a～41e is normal, begins to utilize wafer transfer mechanism 4 from support C, to take out wafer W, when tilting; Find the abnormal posture of fork 41a～41e, control part 7 stops to utilize wafer transfer mechanism 4 from support C, to take out wafer W with regard to control wafer transport mechanism 4.Thereafter, the operator carries out the adjustment operation of fork 41a～41e.
Then the determining positions method to the best of the inspection height and position when the inclination of the above-below direction of the above-mentioned fork 41a～41e of inspection describes.At first shown in Figure 15 A; Conveyance matrix 5 is risen to the height that the 5th fork 41e is positioned at above-mentioned optical axis L top from the height of the above-mentioned optical axis L of the first fork 41a crosscut; The conveyance matrix 5 of this moment is obtained as the pulse value of encoder 54 with respect to the height and position data of above-mentioned optical axis L; Receive light-non-data that receive light through what optical sensor 62 was obtained each fork 41a～41e simultaneously, make the data of above-mentioned these height and position data and optical sensor 62 corresponding each other and obtain as data 1.
Then shown in Figure 15 B; Make conveyance matrix 5 drop to the position that the first fork 41a is positioned at above-mentioned optical axis L below from the height of the above-mentioned optical axis L of the 5th fork 41e crosscut; Same with data 1, make the data of above-mentioned height and position data and optical sensor 62 corresponding and obtain as data 2.
In Figure 15 C, is that example represent data 1 and data 2 with the first fork 41a at this.The data of optical sensor 62 are represented when " 0 " in the above-mentioned optical axis L of fork 41a crosscut, when " 1 ", represent above-mentioned optical axis L and adjacent fork 41b between in.The mean value x1 of the height and position of first data when therefore obtaining the above-mentioned first height and position Z1 for " 0 " and the height and position mean value x2 of the 2nd data preferably are set at the mean value of this x1, x2 the first height and position Z1 of the above-mentioned optical axis L of the first fork 41a crosscut of normal posture.
In addition; Obtain the mean value x4 when the height and position of the mean value x3 of the very first time height and position of above-mentioned the 2nd height and position Z2 when " 1 " and the 2nd data, preferably the mean value with this x3, x4 is set at optical axis L together at first fork 41a of normal posture and the 2nd height and position Z2 between the 2nd fork 41b.
When decision like this; Even under the situation that conveyance matrix 5 is descended above the optical axis L and each fork 41a～41e is checked; Perhaps under the situation that below optical axis L, rises and each fork 41a～41e is checked, can both determine the height and position of each fork 41a～above-mentioned optical axis L of 41e crosscut and optical axis L to be positioned at neighbouring fork 41a～41e height and position each other automatically with reliable precision.Therefore, the situation of the height and position during with the visual decision of operator inspection is compared, and when alleviating the required work of decision operation significantly, can also suppress to check the generation of the deviation of height and position.
The present invention can also be applicable to the wafer transfer mechanism 4 with a plurality of forks that the mode with each mutual drive constitutes.In this case; For example whether fork 41a～41e front and back posture with respect to the horizontal plane checks step normally; Can among fork 41a～41e each be inserted respectively in the inspection unit 6 and carry out, also can a plurality of fork 41a～41e be inserted in the inspection unit 6 simultaneously and carry out.
In this case, control part 7 has a fork 41a under the unusual situation, can not re-use this fork 41a by control wafer transport mechanism 4 in judging a plurality of fork 41a～41e, only is to use all the other normal fork 41b～41e.In this case, wafer transfer mechanism 4 can only use normal fork 41b～41e will remain in the whole transfers of the wafer W arresting stops after the brilliant boat 32 in the support C.After this, the operator can carry out the adjustment operation of fork 41a.
In the present invention, comprise a plurality of vertical heat processing apparatus 200, under the situation of these devices being managed, can utilize the time band at the intermittence that is not carried out to batch processing to check whether the posture of fork 41a～41e is normal through master computer.In this case, under the situation of the abnormal posture that detects fork 41a～41e before the batch processing of carrying out reality, with this advisory master computer.Control with the mode in the predetermined a collection of device of in detecting the unusual device of fork 41a～41e, handling that is assigned to other through master computer then, realize the efficient activity of factory's automatic assembly line.
In addition in the present invention, also can check with respect to the front and back posture of the horizontal plane of advance and retreat axle driving and reversing mechanism 45.In this case, in the position, two places of the advance and retreat direction of for example fork 41a～41e, the light-non-that receives that for example obtains from optical sensor 62 near the position the front end and near the position the cardinal extremity receives the data of light.Judge above-mentioned advance and retreat axle based on these height and positions of obtaining data and conveyance matrix 5 and on above-below direction, have or not inclination.If the data from optical sensor 62 of position, promptly above-mentioned two place are different, then judge above-mentioned advance and retreat axle and tilt at above-below direction, judge that above-mentioned posture is unusual situation.
The present invention is applicable to the substrate transferring unit that a keeping arm is arranged.In addition,, can use the optical sensor with the keeping arm equal number, a plurality of keeping arms front and back posture is with respect to the horizontal plane checked simultaneously comprising the substrate transferring unit of a plurality of keeping arms.Perhaps use a plurality of optical sensors to the several inspections of carrying out above-mentioned posture simultaneously in a plurality of keeping arms.
The present invention can also be applicable to that support C divides the device of the structure of two sections settings on short transverse, and in this case, each support C can be provided with inspection unit near this support C.In addition, maintenance tool of the present invention not only comprises support C, also comprises brilliant boat 32, also can near brilliant boat 32, inspection unit be set.
In addition, the device to the transfer semiconductor wafer in above-mentioned execution mode is illustrated, but the present invention also goes for the device of transfer at FPD (flat-panel monitor) or the glass substrate that in shielding etc., uses.

Claims (4)

1. a substrate shifting apparatus is set in the substrate board treatment, carries to put a plurality of substrates, it is characterized in that, comprising:
Keep tool, the shelf shape keeps a plurality of substrates;
The substrate transferring unit takes out said substrate from said maintenance tool, has when keeping said substrate a plurality of keeping arms of the level that freely is provided with along advance and retreat axle advance and retreat and supports the conveyance matrix of said a plurality of keeping arms;
Optical sensor, the optical axis of formation level, said optical axis are positioned at the position of the peripheral side of each said keeping arm of crosscut when said conveyance matrix is gone up and down with respect to said optical sensor;
Lifting unit links with said conveyance matrix, and said conveyance matrix is relatively gone up and down with respect to said optical sensor;
The height and position detecting unit links with said lifting unit, detects the height and position of said conveyance matrix with respect to said optical axis; With
Control part; Will said keeping arm the axial posture of said advance and retreat just often and said keeping arm do not keep under the state of said substrate; Through make said conveyance matrix with respect to said optical sensor go up and down to obtain from said optical sensor receive the height and position of testing result and said conveyance matrix that light-non-receives light as the storage of benchmark form at the reference data storage part
Said control part has judging unit; Said judging unit; With the data of said benchmark form during with inspection through making said conveyance matrix compared by the testing result of light and the height and position of said conveyance matrix with respect to the light-non-that receives that said optical sensor goes up and down to obtain from said optical sensor; When the error of the amount of height of each said keeping arm surpasses the scope of regulation, be judged as unusual
The said keeping arm of judgment unit judges in the axial abnormal posture of said advance and retreat the time, said control part is controlled said substrate transferring unit, makes to stop from said maintenance tool, taking out substrate.
2. substrate shifting apparatus as claimed in claim 1 is characterized in that:
On said conveyance matrix can advance and retreat independently of each other or the mode of advance and retreat is range upon range of together that said a plurality of keeping arm is set.
3. substrate shifting apparatus as claimed in claim 2 is characterized in that:
Said lifting unit goes up and down said conveyance matrix with the mode of the optical axis of the common optical sensor of said a plurality of keeping arm crosscuts, and whether the said judging unit of said control part carries out said posture in said a plurality of keeping arms each and judge normally.
4. substrate transfer method, it uses substrate shifting apparatus, and said substrate shifting apparatus has: keep tool, the shelf shape keeps a plurality of substrates; The substrate transferring unit takes out said substrate from said maintenance tool, has when keeping said substrate a plurality of keeping arms of the level that freely is provided with along advance and retreat axle advance and retreat and supports the conveyance matrix of said a plurality of keeping arms; And optical sensor, the optical axis of formation level, said optical axis are positioned at the position of the peripheral side of each said keeping arm of crosscut when said conveyance matrix is gone up and down with respect to said optical sensor, and said substrate transfer method is characterised in that, comprising:
Said keeping arm the axial posture of said advance and retreat just often and each said keeping arm do not keep under the state of said substrate; Said conveyance matrix is gone up and down with respect to said optical sensor; Light-the non-that receives that obtains from said optical sensor receives testing result and the said conveyance matrix of the light height and position with respect to said optical axis, the step of storing as the data of benchmark form;
With the data of said benchmark form during with inspection through said conveyance matrix is compared with respect to the height and position of said optical axis with respect to receive testing result and the said conveyance matrix that light-non-receives light from said optical sensor that said optical sensor goes up and down to obtain; Whether surpass the scope of regulation according to the error of the amount of height of each said keeping arm, judge each said keeping arm in the axial posture of said advance and retreat normal step whether; With
When judge said keeping arm in the axial abnormal posture of said advance and retreat the time, control said substrate transferring unit, make the step stop to take out substrate from said maintenance tool.
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